Improvement in minees  pick



@initier lteres istituti @fitte HENRY M. HAMILTON, OF yNEW YORK, N. Y.

Letters .Patent 1Y0.. 67,875, dated August 20, 1867; antedated August 1, 1867.

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fro ALL WHoM rr MAY eoNcERN:

Be it known that 1, HENRY M. HAMILTON, of the city, county, and State of New York, have invented a new and improved Miners Pick; and I do hereby declare the following to be a full, clear, and exact descrip-` tion ofthe same, suihcient toena'ble one skilled in the art to which the invention appertains to make useof it, reference being had to the accompanying drawings, which form a part-of this speci'rication, and in which- Figure 1 shows two views of a pick, the eye of which has parallel sides and flaring ends.

Figure 2 shows the converse, the sides being llaring und the ends parallel.

Figure 3 is introduced as a diagram, showing'the form of helves adapted tc a pick whose vsides are all parallel, that is, oi` equal size and even shape 'throughout its length. v A

Figures. shows views in which the sidesiof the eye are parallel throughout', and a part, say the upper one- 'thir'd'of the ends, is Haring. Y Y

I Figure 5 shows an arrangement, the converse of fig. 4, the ends of the eye lbeing parallel. and the sides for their upper one-third being flaring.

Figure 6 shows views iu which the upper one-third of the eye is flaring both on the sides and ends, and the other being parallel portions of the walls. Y i

This pick has an eye in which the sides are partly parallel and partly flaring. The parallel opposite portions of the eye adhere to the helve and give it stability to resist jarring loose, while the Haring; portion becomes jammed in the eye and sets the pick firmly without wedges. A definite Objectis accomplished by the yparallel portions, and by the Haring portions ofthe eye. By the parallelism a certain stability is gained which prevents the helve becoming loosenedA so readily as when the head of the helve is llaring all round, and by giving a-ilare to a portion of it a certain deeisivetightness is gained which obviates the necessity ot' wedges. In the ordinary construction of `miners' picks the eye is made flaring, so thatthe bulging head of the helve becomes jammed therein, but it is readily started loose unless wedged, and amstart of a sixteenth of an inch makes it entirely loose and unts it for its duty.

When the eye of the piek is made as represented in iig. 3, with all the sides parallel, unless the helve exactly fits it and fully 4fills it, the pick is not secure without wedging, though it isnot so'easilyrja-rred loose as a helve in which the eye is made flaring all round. It is the purpose of this invention to unite both advantages by making a portion of the eye with parallel sides or walls, unda portion flaring, andthe figs. 1, 2, 4, 5, 6 are I illustra-tions of dilerent modes. of accomplishing this result, the distinguishing dilerences having already been stated.

The eye ouf the pick may be round or elliptical, orr a. modification of the latter, in whichthe ,section shows two bounding curves. It is my object to construct the eye vso that the handle may be readily attached and detached by force applied in the directionof the length of the handle,but retain its place with all possible stability when in use.' The conditions of vits use as a mining tool require that the tool shall be'unhelved several times a day for resharpening,-and the use of wedges to spread its end, as commonly` practised, soon destroys it. ,Handles are valuable and not readily replaced in many mining sections, and I-have constructed lthe eye so that it admits of a handle whose sides are partly parallel, to give the pick security against jarring loose and carrying their own wedges by giving some portion of the handle in the eye a. flaring shape, whichbinds against'the sides of the eye of counterpart foi-m.

Having described my invention, what I claim therein as new, andpdesire to secure by Letters Patent, is#- A pick or mattock constructed with an eye open at each end, and whose sides are partly parallel and partly Aflaring, and adapted to the introduction of a handle whose sides are of counterpart form, und whose flaring sides are adapted to'wedge in 'said eye, substantially as described and represented.

To the above specification of my improved miners pick have signed myhand this'QSth of Deeember,1866.

H. M. HAMILTON.

Witnesses:

SoLoN C. KnMoN, Gso. W. RoTnwELL. 

